diff options
Diffstat (limited to 'xmerge/source/xmerge/java/org/openoffice/xmerge/converter/palm/PdbDecoder.java')
| -rw-r--r-- | xmerge/source/xmerge/java/org/openoffice/xmerge/converter/palm/PdbDecoder.java | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/xmerge/source/xmerge/java/org/openoffice/xmerge/converter/palm/PdbDecoder.java b/xmerge/source/xmerge/java/org/openoffice/xmerge/converter/palm/PdbDecoder.java new file mode 100644 index 000000000000..68e7c66beb11 --- /dev/null +++ b/xmerge/source/xmerge/java/org/openoffice/xmerge/converter/palm/PdbDecoder.java @@ -0,0 +1,233 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +package org.openoffice.xmerge.converter.palm; + +import java.io.RandomAccessFile; +import java.io.IOException; +import java.io.ByteArrayInputStream; +import java.io.DataInputStream; + +/** + * <p>Provides functionality to decode a PDB formatted file into + * a <code>PalmDB</code> object given an <code>InputStream</code>. + * This class is only used by the <code>PalmDB</code> object.</p> + * + * <p>Sample usage:</p> + * + * <blockquote><pre><code> + * PdbDecoder decoder = new PdbDecoder("sample.pdb"); + * PalmDB palmDB = decoder.parse(); + * </code></pre></blockquote> + * + * <p>This decoder has the following assumptions on the PDB file:</p> + * + * <p><ol> + * <li>There is only one RecordList section in the PDB.</li> + * <li>The <code>Record</code> indices in the RecordList are sorted in + * order, i.e. the first <code>Record</code> index refers to + * <code>Record</code> 0, and so forth.</li> + * <li>The raw <code>Record</code> in the <code>Record</code> section + * are sorted as well in order, i.e. first <code>Record</code> + * comes ahead of second <code>Record</code>, etc.</li> + * </ol></p> + * + * <p>Other decoders assume these as well.</p> + * + * @author Herbie Ong + * @see PalmDB + * @see Record + */ +public final class PdbDecoder { + + + /** + * <p>This method decodes a PDB file into a <code>PalmDB</code> + * object.</p> + * + * <p>First, the header data is read using the <code>PdbHeader</code> + * <code>read</code> method. Next, the RecordList section is + * read and the <code>Record</code> offsets are stored for use when + * parsing the Records. Based on these offsets, the bytes + * corresponding to each <code>Record</code> are read and each is + * stored in a <code>Record</code> object. Lastly, the data is + * used to create a <code>PalmDB</code> object.</p> + * + * @param fileName PDB file name. + * + * @throws IOException If I/O error occurs. + */ + public PalmDB parse(String fileName) throws IOException { + + RandomAccessFile file = new RandomAccessFile(fileName, "r"); + + // read the PDB header + PdbHeader header = new PdbHeader(); + header.read(file); + + Record recArray[] = new Record[header.numRecords]; + if (header.numRecords != 0) { + + // read in the record indices + offsets + + int recOffset[] = new int[header.numRecords]; + byte recAttrs[] = new byte[header.numRecords]; + + for (int i = 0; i < header.numRecords; i++) { + + recOffset[i] = file.readInt(); + + // read in attributes (1 byte) + unique id (3 bytes) + // take away the unique id, store the attributes + + int attr = file.readInt(); + recAttrs[i] = (byte) (attr >>> 24); + } + + + // read the records + + int len = 0; + byte[] bytes = null; + + int lastIndex = header.numRecords - 1; + + for (int i = 0; i < lastIndex; i++) { + + file.seek(recOffset[i]); + len = recOffset[i+1] - recOffset[i]; + bytes = new byte[len]; + file.readFully(bytes); + recArray[i] = new Record(bytes, recAttrs[i]); + } + + // last record + file.seek(recOffset[lastIndex]); + len = (int) file.length() - recOffset[lastIndex]; + bytes = new byte[len]; + file.readFully(bytes); + recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]); + + } + + file.close(); + + // create PalmDB and return it + PalmDB pdb = new PalmDB(header.pdbName, header.creatorID, + header.typeID, header.version, header.attribute, recArray); + + return pdb; + } + + /** + * <p>This method decodes a PDB file into a <code>PalmDB</code> + * object.</p> + * + * <p>First, the header data is read using the <code>PdbHeader</code> + * <code>read</code> method. Next, the RecordList section is + * read and the <code>Record</code> offsets are stored for use when + * parsing the Records. Based on these offsets, the bytes + * corresponding to each <code>Record</code> are read and each is + * stored in a <code>Record</code> object. Lastly, the data is + * used to create a <code>PalmDB</code> object.</p> + * + * @param b <code>byte[]</code> containing PDB. + * + * @throws IOException If I/O error occurs. + */ + + public PalmDB parse(byte[] b) throws IOException { + + ByteArrayInputStream bais = new ByteArrayInputStream(b); + DataInputStream dis = new DataInputStream(bais); + + // read the PDB header + + PdbHeader header = new PdbHeader(); + header.read(dis); + + Record recArray[] = new Record[header.numRecords]; + if (header.numRecords != 0) { + + // read in the record indices + offsets + + int recOffset[] = new int[header.numRecords]; + byte recAttrs[] = new byte[header.numRecords]; + + for (int i = 0; i < header.numRecords; i++) { + + recOffset[i] = dis.readInt(); + + // read in attributes (1 byte) + unique id (3 bytes) + // take away the unique id, store the attributes + + int attr = dis.readInt(); + recAttrs[i] = (byte) (attr >>> 24); + } + + // read the records + + int len = 0; + byte[] bytes = null; + + int lastIndex = header.numRecords - 1; + + for (int i = 0; i < lastIndex; i++) { + + //dis.seek(recOffset[i]); + dis.reset(); + dis.skip(recOffset[i]); + len = recOffset[i+1] - recOffset[i]; + bytes = new byte[len]; + dis.readFully(bytes); + recArray[i] = new Record(bytes, recAttrs[i]); + } + + // last record + + dis.reset(); + len = (int) dis.available() - recOffset[lastIndex]; + dis.skip(recOffset[lastIndex]); + bytes = new byte[len]; + dis.readFully(bytes); + recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]); + } + + + + // create PalmDB and return it + + PalmDB pdb = new PalmDB(header.pdbName, header.creatorID, + header.typeID, header.version, header.attribute, recArray); + + return pdb; + } + + + +} + |